Allow ExecuteSQL(Record) properties to evaluate flowfile attributes where possible

Some properties in ExecuteSQL and ExecuteSQLRecord only evaluate variables and not flowfile attributes, even if the values are obtained per-flowfile (in onTrigger, e.g.). In these cases, it would make the processors more flexible if those properties could evaluate flowfile attributes as well. A use case is for multiple tables with varying number of columns and rows, when the overall output flowfile size is desired to be around the same for each flow file.